The Role of GeO 2 and In 2 O 3 in the Glass-Ceramic Formation and Microstructure of Lithium Alumino-Silicate Glasses
Tóm tắt
The crystallization characteristics of the glasses based on the Li2O–Al2O3–SiO2 system have been investigated. The base glass composition was modified by partial replacement of GeO2 for SiO2 and In2O3 for Al2O3. The effect of the compositional variation on the crystallization products of the glasses and the type of the solid solution (ss) phases formed as well as the resulting microstructure were traced by differential thermal analysis (DTA), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). A decrease in the endothermic and exothermic temperatures was detected by the replacement processes. β -spodumene ss, β -eucryptite ss, lithium meta- and di-silicate, lithium aluminum germanate and two forms of indium-containing phases (LiInSi2O6 & In2Si2O7 phases) were mostly developed in the crystallized glasses. The objective of the present work is to understand the role of the glass oxide constituents in determining the type of the crystalline phases formed, their solid solution formed and the microstructure of the resultant glass-ceramic materials.
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